marital affair. tara merger joins us from washington. >> reporter: good morning. that's right. jill kelly a long time friend of the petraeus family apparently went to the fbi several months ago with her concerns and that led o to a revelation about the affair. and now congressments more information about the fbi's investigate. >> reporter: cbs has learned this girl, jill kelly triggered an investigation leading to the resignation of david petraeus. petraeus resigned friday after word got out he was having an affair with his biographer paula broadwell. his resignation caught many off guard. kelly went to the fbi after allegedly receiving e-mails from broadwell warning her to back off and stay away from my guy. officials say broadwell believed kelly was a romantic rival. broadwell made this comment about petraeus during a publicity tour. >> i think he has been a terrific role model for young people. >> reporter: congressional leaders say they are going to start an inquiry of their own. >> this is something that could have had an effect on national security. i think we should have been told.